Rick---I agree with Peter M. on the likelyhood of it being one of the
U-joints. Just in case it isn't obvious which one (of the six) is the
culprit, here's a way to narrow it down-----Jack up one rear wheel so
the other is still on the ground. Leave the transmission in neutral.
Turning the wheel will turn four of the u-joints and odds are this
should expose the one with the bad bearings. Go both directions, if
necessary.
If you don't feel a "hitch" while doing so, lower this side of the car
and raise the other side, keeping the original wheel on the ground. If
it shows up this way, the problem is one of the two in this axle.
A bad U-joint doesn't usually show up the way you found yours. (Assuming
that's what you have) They lose their lubrication and chew themselves up
as the result of high mileage. Should the bad 'joint be one of the two
in the prop shaft, it's best to change both while the shaft is out, and
because of the hassle of getting to them.
Arm yourself with one of the better manuals that covers the TR6, if you
like doing your own work.
Dick Taylor
L.A.
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